package clause

type JoinType string

const (
	CrossJoin JoinType = "CROSS"
	InnerJoin JoinType = "INNER"
	LeftJoin  JoinType = "LEFT"
	RightJoin JoinType = "RIGHT"
)

// Join clause for from
type Join struct {
	Type       JoinType
	Table      Table
	ON         Where
	Using      []string
	Expression Expression
}

func (join Join) Build(builder Builder) {
	if join.Expression != nil {

							}

							if isNestedJoin {
								isRelations = true
								relations = gussNestedRelations
							}
						}
					}

					if isRelations {
						genJoinClause := func(joinType clause.JoinType, parentTableName string, relation *schema.Relationship) clause.Join {
							tableAliasName := relation.Name
							if parentTableName != clause.CurrentTable {

	return joins(db, clause.InnerJoin, query, args...)
}

func joins(db *DB, joinType clause.JoinType, query string, args ...interface{}) (tx *DB) {
	tx = db.getInstance()

	if len(args) == 1 {
		if db, ok := args[0].(*DB); ok {
			j := join{
				Name: query, Conds: args, Selects: db.Statement.Selects,
				Omits: db.Statement.Omits, JoinType: joinType,
			}

	return c&0x3 != 0
}

func (c info) category() category {
	small := c & catSmallMask
	if small != 0 {
		return category(small)
	}
	return category(c & catBigMask)
}

func (c info) joinType() info {
	if c.isMapped() {
		return 0
	}
	return (c >> joinShift) & joinMask
}

func (c info) isModifier() bool {
	return c&(modifier|catSmallMask) == modifier
}

	scopes               []func(*DB) *DB
}

type join struct {
	Name     string
	Conds    []interface{}
	On       *clause.Where
	Selects  []string
	Omits    []string
	JoinType clause.JoinType
}

// StatementModifier statement modifier interface
type StatementModifier interface {
	ModifyStatement(*Statement)
}

// WriteString write string

	}
	// Quickly return in the absence of zero-width (non) joiners.
	if strings.Index(s, zwj) == -1 && strings.Index(s, zwnj) == -1 {
		return nil
	}
	st := stateStart
	for i := 0; ; {
		jt := x.joinType()
		if s[i:i+sz] == zwj {
			jt = joinZWJ
		} else if s[i:i+sz] == zwnj {
			jt = joinZWNJ
		}
		st = joinStates[st][jt]
		if x.isViramaModifier() {
			st = joinStates[st][joinVirama]
		}

	}
	// Quickly return in the absence of zero-width (non) joiners.
	if strings.Index(s, zwj) == -1 && strings.Index(s, zwnj) == -1 {
		return nil
	}
	st := stateStart
	for i := 0; ; {
		jt := x.joinType()
		if s[i:i+sz] == zwj {
			jt = joinZWJ
		} else if s[i:i+sz] == zwnj {
			jt = joinZWNJ
		}
		st = joinStates[st][jt]
		if x.isViramaModifier() {
			st = joinStates[st][joinVirama]
		}